PHP: call child constructor from static method in parent

Question

I want to have a static method in a parent class that creates instances of whatever subclass i call this method on.

An example to make this more clear:

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Answer 1

I think you want something like this:

class parent {
  public static function make_object($conditionns) {
    if($conditions == "case1") {
      return new sub();
    }
  }
}

class sub extends parent {

}

Now you can create an instance like this:

$instance = parent::make_object("case1");

or

$instance = sub::make_object("case1");

But why would you want all the sub classes to extend the parent? Shouldn't you much rather have a parent for your models (sub classes) and then a factory class, that creates the instances for this models depending on the conditions given?